Badger Meter Blancett B220-880 Manual de usuario

K-Factor Scalers

Models B220-880, B220-881, B220-882 and B220-885

SGN-UM-00281-EN-06 (June 2021) User Manual

B220-880

B220-881

B220-882

B220-885

K-Factor Scalers, Models B220-880, B220-881, B220-882 and B220-885

Page ii June 2021

CONTENTS

Scope of This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Unpacking and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Terminology and Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Electrical Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Operating Principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Enclosure Mounting (necessary for CSA certication). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Turbine Meter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Startup and Conguration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Setting the K-Factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Setting the Output Pulse Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Setting the Output Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Setting the Internal or External Pullup Resistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Pulse Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Internal Pullup Resistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

External Pullup Resistor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

K-Factors Explained . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Calculating K-Factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

User Manual

Page iiiJune 2021

K-Factor Scalers, Models B220-880, B220-881, B220-882 and B220-885

Page iv June 2021

SCOPE OF THIS MANUAL

This manual is intended to help you get the K-Factor scalers up and running quickly.

MPORTANTI

Read this manual carefully before attempting any installation or operation. Keep the manual accessible for future reference.

UNPACKING AND INSPECTION

Upon opening the shipping container, visually inspect the product and applicable accessories for any physical damage such

as scratches, loose or broken parts, or any other sign of damage that may have occurred during shipment.

OTE:N If damage is found, request an inspection by the carrier’s agent within 48 hours of delivery and file a claim with the

carrier. A claim for equipment damage in transit is the sole responsibility of the purchaser.

SAFETY

Terminology and Symbols

Indicates a hazardous situation, which, if not avoided, is estimated to be capable of causing death or

serious personal injury.

Indicates a hazardous situation, which, if not avoided, could result in severe personal injury or death.

Indicates a hazardous situation, which, if not avoided, is estimated to be capable of causing minor or

moderate personal injury or damage to property.

Considerations

The installation of the B220-880 and B220-881 K-Factor scaler must comply with all applicable federal, state, and local rules,

regulations, and codes.

CAUTION

IF THE EQUIPMENT IS USED IN A MANNER NOT SPECIFIED BY THE MANUFACTURER, THE PROTECTION PROVIDED BY

THE EQUIPMENT MAY BE IMPAIRED.

AVERTISSMENT

DANS LE CAS D'UNE UTILISATION NON PRÉVUE PAR LE FABRICANT, LA PROTECTION FOURNIE PAR L'ÉQUIPEMENT PEUT

ÊTRE RÉDUITE.

CAUTION

FOR FIELD WIRING CONNECTIONS, WIRE MUST BE RATED AT 158°F (70°C) OR HIGHER.

AVERTISSMENT

POUR DES CÂBLAGES SUR LE TERRAIN, LES CÂBLES DOIVENT ÊTRE ÉVALUÉS À 70° C (158° F) MINIMUM.

MPORTANTI

Not following instructions properly may impair safety of equipment and/or personnel.

MPORTANTI

Must be operated by a class 2 power supply suitable for the location.

Electrical Symbols

Function Direct Current Caution

Symbol

Scope of This Manual

Page 5June 2021 SGN-UM-00281-EN-06

INTRODUCTION

The K-Factor scaler is a field adjustable frequency divider, which interfaces the output signal from a turbine meter with a

magnetic pickup to the input of a PLC, RTU, CPU data acquisition card or similar totalizer device. The adjustable frequency

divisor, referred to as the K-factor, allows the pulses being sent from a turbine meter to be divided into a recognizable unit

that an end device, such as a PLC, can count and display.

Different K-factors allow the device to display in any number of volume measurements such as gallons, cubic meters,

liters, barrels and like units. A calibration sheet provided with a turbine meter lists a nominal K-factor or other frequency

information specific to that particular flow meter, tested to a specific volumetric flow rate. This K-factor can be placed directly

into the K-factor scaler to provide an output with the same volumetric flow rate or modified to a different volumetric flow rate

by recalculating the K-factor with the appropriate conversion factor.

In addition, if the K-factor is set to one, the K-factor scaler can be used as a preamplifier where the frequency from a low level

turbine meter is proportional to the logic level frequency output needed by a PLC or CPU data acquisition card. This option

allows the end device to control the dividing process of the turbine meter output to a recognizable flow rate.

OPERATING PRINCIPLE

Fluid moving though a turbine flow meter causes the rotor to rotate in relation to the flow rate. The rotation of the rotor

blades cuts through the magnetic field generated by the magnetic pickup, which generates a frequency output signal that is

directly proportional to the speed of the rotor.

Turbine Rotor

Magnetic Pickup

Other Frequency

Output Device

Output

Signal

Figure 1: Schematic illustration of electric signal generated by rotor movement

The signal produced is received by the K-factor scaler input amplifier, which has an input sensitivity of 30 mVp-p…30Vp-p. The

signal is then sent to an onboard microcontroller, which acts as a divisor with a range of 1…999,999,999. The divisor (K-factor)

is user adjustable and set by programming it into the board. The microcontroller handles the dividing process by counting the

input pulses and comparing it to the programmed K-factors. Once the count equals this value, an output pulse occurs for a

selectable time period and the counting process starts over.

Introduction

Page 6 June 2021SGN-UM-00281-EN-06

INSTALLATION

The K-Factor scaler was designed with terminal connections with removable plugs for easy connection and removal from the

system after installation. See Figure 2 for the I/O terminal connections. The board connections include voltage input, turbine

meter input and the pulse output to a totalizing device.

12345

ON C&K SDA05

99999999

, ,

S10

Voltage Input

8.5…30V DC

Pulse Output

DIP Switches

(for selecting pulse width,

pulse state and pullup

resistor options)

Turbine Meter

Input

Factory Use Only

Figure 2: Input/Output terminal connections

Enclosure Mounting (necessary for CSA certication)

If the circuit board assembly is supplied without an enclosure, it must be mounted within a certified Appleton one inch NPT

model GRL100-A or GRLB100-A conduit outlet box to maintain the CSA “Ordinary Locations”certification. The label containing

the hookup information should be placed on the inside of the cover of the enclosure. The label containing the CSA logo

should be placed on the bottom exterior of the enclosure.

Power

The K-factor scaler requires 8.5…30V DC to operate. The power connections are reverse polarity protected by a diode, but

must be connected properly for operation of the device. Polarity is shown in Figure 2.

Turbine Meter

The turbine meter connections are non-polarized and located on a separate 2-position terminal. Use shielded, twisted pair

wire for this connection.

Installation

Page 7June 2021 SGN-UM-00281-EN-06

STARTUP AND CONFIGURATION

After the K-factor scaler has been properly installed, apply power. The unit can be configured with the power either on or off.

If the power is on, the onboard microcontroller constantly scans for any changes and adjusts accordingly. The pulse output

should be ignored while any changes are being made with the power applied. Any changes cause the internal counter to

reset and cause the dividing process to start over.

Setting the K-Factor

The K-factor is the ratio of input pulses per each output pulse and can be viewed as a divisor. The minimum K-factor can be set

to 1 where each input pulse yields an output pulse. The maximum K-factor can be set to 999,999,999 where it would take this

many input pulses to yield one output pulse.

The K-factor is set using the eight rotary switches. Each switch is a ten position switch that is used to select a number from

0…9 by pointing the arrow to the corresponding digit inscribed on its casing. When looking at the K-factor scaler board

so that the text 99,999,999 is below the switches, the right most switch represents the least significant digit of the K-factor

number (see Figure 2 on page 7). For example, to set the K-factor as 4572, the switches should be set as shown in Figure 3.

99994572

, ,

Figure 3: Setting the rotary switches

Setting the Output Pulse Width

The output pulse width is the length of time the pulse remains active before resetting to the resting state. The K-factor scaler

has six different pulse widths. Some end devices require that the pulse be a certain length or longer for proper detection of

each incoming pulse. For these devices, select a pulse width that is long enough for the end device to recognize.

DIP Switch

The pulse width options are selected by the DIP switch positions 1, 2 and 3. Table 1 shows the position of each switch to select

the correct pulse width output.

Pulse Width DIP Switch

1 2 3

150 µs ▼ ▼ ▼

1 ms ▲ ▼ ▼

25 ms ▼ ▲ ▼

100 ms ▲ ▲ ▼

500 ms ▼ ▼ ▲

1 s ▲ ▼ ▲

Auto ▼ ▲ ▲

Factory Test ▲ ▲ ▲

12345

ON C&K SDA05 UP (ON)

DOWN (OFF)

Table 1: DIP switch settings for selecting the width of the output pulse Figure 4: Pulse width settings

Startup and Conguration

Page 8 June 2021SGN-UM-00281-EN-06

Setting the Output Level

Most end devices are unaffected by this setting, but the K-factor scaler board has the ability to invert the output pulse level.

This option is controlled by position 4 of the DIP switch.

When the switch is in the off position (see Figure 5), the output level is normally low and the duration of the selected pulse

width is high. When the switch is in the on position (see Figure 5), the output level is normally high and the duration of the

selected pulse width is low.

Switch 4 Function Switch 5 Function

Output (Normally High) ▲Internal Pullup used ▲

Output (Normally Low) ▼External Pullup required ▼

Table 2: Switch 4 and 5 settings 12345

ON C&K SDA05 UP (ON)

DOWN (OFF)

Figure 5: Switch 4 settings

Setting the Internal or External Pullup Resistor

Either the internal pullup resistor or an external resistor must be used for the K-factor scaler board to provide an output pulse.

This option is controlled by position 5 of the DIP switch.

12345

ON C&K SDA05 UP (ON)

DOWN (OFF)

Figure 6: Switch 5 settings

When DIP switch 5 is in the on position (see Figure 6), the internal 3.6 k pullup resistor is connected to the input voltage of

the board. The output pulse swing is approximately 0.7 volts less than the input voltage to near zero volts.

Setting DIP switch 5 in the off position (see Figure 6), the internal pullup resistor is disconnected and an external pullup

resistor and supply voltage are required.

Pulse Output

Either the internal or an external pullup resistor is required for the K-factor scaler to provide an output pulse. An onboard

jumper controls the pullup resistor selection. With the jumper installed, the internal pullup resistor is connected. Without the

jumper, an external pullup is required. See Table 2 for the I/O terminal connections.

Startup and Conguration

Page 9June 2021 SGN-UM-00281-EN-06

Internal Pullup Resistor

The internal pullup resistor is used for a simple installation. Make sure that the device being connected to the pulse output

can accept voltage levels as high as the supply feeding the K-factor scaler. Make sure the output pulse from the K-factor scaler

can supply enough current for the receiving device to read the pulse when using an internal pullup resistor. Use the following

equation to calculate the available current that the K-factor scaler can supply to the receiving device. See Figure 7.

Available Current = (Input Voltage - 0.7V)

(3600Ω+ 47Ω)

Using the equation above, the maximum current available at an input voltage of 30V is 8 mA. Verify that the receiving device

input current requirement is below this value for proper operation. Use an external pullup resistor less than 3.6 k if the value

is higher than the available current.

12345

ON C&K SDA05

12345

ON C&K SDA05

99999999

, ,

S10

TB1

Open Collector

Pulse Output

Switch 5 On

(Up)

8 mA

Maximum

Voltage Input

Internal

3.6k Ω

Figure 7: Wiring schematic with internal pullup resistor in circuit

Startup and Conguration

Page 10 June 2021SGN-UM-00281-EN-06

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